7772a2df9dPR-URL: https://github.com/nodejs/node/pull/59805 Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Richard Lau <richard.lau@ibm.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
77 lines
1.9 KiB
JavaScript
77 lines
1.9 KiB
JavaScript
// Copyright 2025 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// Flags: --allow-natives-syntax --maglev
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function create1() {
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return new String();
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}
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%PrepareFunctionForOptimization(create1);
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create1();
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%OptimizeMaglevOnNextCall(create1);
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let s1 = create1();
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assertTrue(s1 instanceof String);
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assertEquals('object', typeof s1);
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assertEquals('', s1.valueOf());
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assertTrue(isMaglevved(create1));
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function create2(v) {
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return new String(v);
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}
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%PrepareFunctionForOptimization(create2);
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create2('hello');
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%OptimizeMaglevOnNextCall(create2);
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let s2 = create2('hello');
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assertTrue(s2 instanceof String);
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assertEquals('object', typeof s2);
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assertEquals('hello', s2.valueOf());
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let s3 = create2(42);
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assertTrue(s3 instanceof String);
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assertEquals('object', typeof s3);
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assertEquals('42', s3.valueOf());
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let sym = Symbol('private');
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assertThrows(() => create2(sym));
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let obj = {toString: () => {return 'stuff';}};
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let s4 = create2(obj);
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assertEquals('object', typeof s4);
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assertEquals('stuff', s4.valueOf());
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// No toString function here, but there's Object.prototype.toString.
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let obj2 = {};
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let s5 = create2(obj2);
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%DebugPrint(s5);
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assertEquals('object', typeof s5);
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assertEquals('[object Object]', s5.valueOf());
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assertTrue(isMaglevved(create2));
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function create3() {
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return new String('constant');
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}
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%PrepareFunctionForOptimization(create3);
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create3();
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%OptimizeMaglevOnNextCall(create3);
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let s6 = create3();
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assertTrue(s6 instanceof String);
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assertEquals('object', typeof s6);
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assertEquals('constant', s6.valueOf());
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function create4() {
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return new String(1983);
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}
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%PrepareFunctionForOptimization(create4);
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create4();
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%OptimizeMaglevOnNextCall(create4);
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let s7 = create4();
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assertTrue(s7 instanceof String);
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assertEquals('object', typeof s7);
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assertEquals('1983', s7.valueOf());
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